Doing a bit of reading - this device might do the trick

http://www.linear.com/pdf/4411f.pdf

Richard


Richard Hosking wrote:
Dear all
I want to design a power supply for a low power rig with protection for
reverse and overvoltage. The requirement would be about 1A at 12-14V.
What is the best way of achieving this? I guess a diode would give
reverse voltage protection but the 0.6V drop is a problem.

Richard